#mainContainer {
  position: relative;
}

#content, #adContainer {
  position: absolute;
}

#contentElement {
  overflow: hidden;
}

#playButton {
  position: absolute;
  display: table;
  margin: 150px 150px;
  width: 350px;
  height: 60px;
  padding: 0;
  font-size: 22px;
  color: white;
  text-align: center;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
  background: #2c3e50;
  border: 0;
  border-bottom: 2px solid #22303f;
  cursor: pointer;
  -webkit-box-shadow: inset 0 -2px #22303f;
  box-shadow: inset 0 -2px #22303f;
}